Reactions of macrocyclic rhodium carbenoids: regioselective synthesis of indol-3-yl macrocyclic lactones and cryptands
摘要:
A wide variety of new macrocyclic diazocarbonyl compounds with various spacers was synthesized. Macrocyclic rhodium(H) carberioid insertion with various substituted indoles was performed to afford regioselectively, indol-3-yl macrocyclic di- or tetralactones (C3-alkylation). Double carberioid insertion was also performed to afford indolyl cryptand molecules. (C) 2007 Elsevier Ltd. All rights reserved.
Selective Syntheses of Novel Polyether Fullerene Multiple Adducts
摘要:
We have applied a modified macrocyclic tether approach to control multiple additions to C-60. The technique of He-3 NMR was used to confirm the selective formation of specific C-60 multiple adducts by the macrocyclic tether approach. An oligoglycol was used as a flexible linker to produce macrocyclic polyether-linked malonates 5, 6, 8, and 9 under solid-liquid PTC (phase-transfer-catalysis) conditions. The formation of a single C60 tris-adduct, 3, from macrocyclic malonate 1 and (HeC60)-He-3-C-@ was proven by He-3 NMR. Similarly, multiple additions to C-60 of macrocyclic polyether malonate 5 gave C-60 bis-adduct 10 selectively, while the reaction of C-60 with macrocyclic malonate 8 gave bis-adducts 11 and 12. A similar process with macrocyclic malonate 6 gave tris-adduct 13 with high selectivity as well. Saponification of these C-60 multiple adducts gives the corresponding polyacids that are potentially useful in biological applications. Macrocyclic polyether fullerenes are a new class of ionophores, which could be interesting for molecular recognition and for the development of biosensors.
Selective Syntheses of Novel Polyether Fullerene Multiple Adducts
作者:Zhiguo Zhou、David I. Schuster、Stephen R. Wilson
DOI:10.1021/jo034542l
日期:2003.10.1
We have applied a modified macrocyclic tether approach to control multiple additions to C-60. The technique of He-3 NMR was used to confirm the selective formation of specific C-60 multiple adducts by the macrocyclic tether approach. An oligoglycol was used as a flexible linker to produce macrocyclic polyether-linked malonates 5, 6, 8, and 9 under solid-liquid PTC (phase-transfer-catalysis) conditions. The formation of a single C60 tris-adduct, 3, from macrocyclic malonate 1 and (HeC60)-He-3-C-@ was proven by He-3 NMR. Similarly, multiple additions to C-60 of macrocyclic polyether malonate 5 gave C-60 bis-adduct 10 selectively, while the reaction of C-60 with macrocyclic malonate 8 gave bis-adducts 11 and 12. A similar process with macrocyclic malonate 6 gave tris-adduct 13 with high selectivity as well. Saponification of these C-60 multiple adducts gives the corresponding polyacids that are potentially useful in biological applications. Macrocyclic polyether fullerenes are a new class of ionophores, which could be interesting for molecular recognition and for the development of biosensors.
Reactions of macrocyclic rhodium carbenoids: regioselective synthesis of indol-3-yl macrocyclic lactones and cryptands
A wide variety of new macrocyclic diazocarbonyl compounds with various spacers was synthesized. Macrocyclic rhodium(H) carberioid insertion with various substituted indoles was performed to afford regioselectively, indol-3-yl macrocyclic di- or tetralactones (C3-alkylation). Double carberioid insertion was also performed to afford indolyl cryptand molecules. (C) 2007 Elsevier Ltd. All rights reserved.